Error 623: The system could not find the phone book entry for this connection.
The modem is not installed or configured for Dial-Up Networking. To check
your modem configuration, double click the Modems icon in Control Panel. This
issue can occur if the Telephon.ini file is missing or damaged. To resolve
this issue, follow these steps: 1. Click Start, point to Find, and then click
Files or Folders. 2. In the Named box, type "telephon.ini" (without quotation
marks), and then click Find Now. 3. Locate the telephone.ini file in the ISP
directory, right click it, click Rename, type "telephon.xxx" (without
quotation marks), and then press ENTER. Then locate the telephone.ini file in
the windows directory, right click it, click Rename, type "telephon.yyy"
(without quotation marks), and then press ENTER. 4. Quit to Find tool, click
Start, click Run, type "tapiini.exe" (without quotation marks), and then
press ENTER. 5. Restart your computer.
Solution: Turn the modem on and/or reconnect it to the computer, and then
reboot the system. If you still receive the error message, click the Start
button, Settings, Control Panel, and double-click System. On the System
Properties dialog, click the Hardware Profiles tab and then Device Manager.
Right-click Modems and click Scan For Hardware Changes. Windows will search
for the modem. If it's connected properly, a message will display that the
modem has been found. You should now be able to dial out.
This error can be best remedied by:
-- A restart of your computer tends to resolve 50% of cases with this
-- Disable any Firewall Software and try to connect again...
-- Recreate the Dial Up Connection
-- Try uninstalling and reinstalling the Modem. Details of this are
"Error 633 - the modem (or other connecting device) is already in use" error
message when you try to establish a VPN connection in Windows Server 2003
FIX: A program cannot re-establish communication with a modem device after
the USB cable is quickly reconnected